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Title:
FAR-INFRARED MULTISTAGE HEATING FURNACE FOR HOT-PRESSED STEEL PLATE
Document Type and Number:
WIPO Patent Application WO/2015/186601
Kind Code:
A1
Abstract:
The purpose of the present invention is to provide stable support over an extended period of time to a hot-pressed steel plate which is accommodated within a far-infrared multistage heating furnace, using steel plate support members that have a small planar projected area and minimized thermal deformation. This far-infrared multistage heating furnace has: a heating unit and a ceiling unit provided in multiple stages in the vertical direction, the heating unit and ceiling unit accommodating a hot-pressed steel plate comprising an aluminum-plated steel plate or a zinc-plated steel plate; and far-infrared heaters arranged inside the heating unit and the ceiling unit, the far-infrared heaters heating the hot-pressed steel plate to at least the Ac3 transition point but no higher than 950°C. Within the heating unit are arranged steel plate support members for supporting the hot-pressed steel plate through point contact or line contact against the hot-pressed steel plate, the steel plate support members being supported so as to be capable of expanding and contracting in the longitudinal direction due to thermal expansion or thermal shrinkage.

Inventors:
KUWAYAMA Shinjiro (5-2, Marunouchi 2-chome, Chiyoda-k, Tokyo 05, 〒1000005, JP)
Application Number:
JP2015/065411
Publication Date:
December 10, 2015
Filing Date:
May 28, 2015
Export Citation:
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Assignee:
NIPPON STEEL & SUMIKIN TEXENG. CO., LTD. (5-2 Marunouchi 2-chome, Chiyoda-ku Tokyo, 05, 〒1000005, JP)
SHOWA MANUFACTURING CO., LTD. (3-1-35, Hakozakifutou Higashi-ku, Fukuoka-sh, Fukuoka 87, 〒8128587, JP)
International Classes:
C21D1/00; C21D1/34; F27D5/00
Foreign References:
JP2008296237A2008-12-11
JPH10503581A1998-03-31
JP3056522U1999-02-26
JP2014034689A2014-02-24
Other References:
See also references of EP 3153594A4
Attorney, Agent or Firm:
ICHIHARA Masaki (Toyo Building, 3-13-4 Uchikanda, Chiyoda-k, Tokyo 47, 〒1010047, JP)
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